Semiconductor structure and manufacturing method thereof

ABSTRACT

A semiconductor structure includes a die, a molding surrounding the die, an interconnect structure disposed over the die and the molding, and a first seal ring. The interconnect structure includes a dielectric layer and a conductive member disposed within the dielectric layer. The first seal ring is disposed within the dielectric layer and disposed over the molding.

PRIORITY CLAIM AND CROSS-REFERENCE

This application claims priority to U.S. patent application Ser. No. 15/676,309, filed on Aug. 14, 2017, entitled of “SEMICONDUCTOR STRUCTURE AND MANUFACTURING METHOD THEREOF”, the disclosure of which is hereby incorporated by reference in its entirety.

BACKGROUND

Electronic equipment using semiconductor devices are essential for many modern applications. With the advancement of electronic technology, the semiconductor devices are becoming increasingly smaller in size while having greater functionality and greater amounts of integrated circuitry. Due to the miniaturized scale of the semiconductor device, a system on integrated chip (SoIC) is widely used to integrate several components into a single semiconductor device. During the SoIC operation, a number of components are assembled on a single semiconductor device. Furthermore, numerous manufacturing operations are implemented within such a small semiconductor device.

However, the manufacturing operations of the semiconductor device involve many steps and operations on such a small and thin semiconductor device. The manufacturing of the semiconductor device in a miniaturized scale becomes more complicated. An increase in a complexity of manufacturing the semiconductor device may cause deficiencies such as poor structural configuration, delamination of components, or other issues, resulting in a high yield loss of the semiconductor device and increase of manufacturing cost. As such, there are many challenges for modifying a structure of the semiconductor devices and improving the manufacturing operations.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It is emphasized that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.

FIG. 1 is a schematic cross sectional view of a semiconductor structure in accordance with some embodiments of the present disclosure.

FIG. 2 is a schematic top cross sectional view of a second dielectric layer and a first seal ring in FIG. 1.

FIG. 3 is a schematic cross sectional view of a semiconductor structure in accordance with some embodiments of the present disclosure.

FIG. 4 is a schematic top cross sectional view of a second dielectric layer and a first seal ring in FIG. 3.

FIG. 5 is a schematic cross sectional view of a semiconductor structure in accordance with some embodiments of the present disclosure.

FIG. 6 is a flow diagram of a method of manufacturing a semiconductor structure in accordance with some embodiments of the present disclosure.

FIGS. 7A-7K are schematic views of manufacturing a semiconductor structure by a method of FIG. 6 in accordance with some embodiments of the present disclosure.

DETAILED DESCRIPTION OF THE DISCLOSURE

The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Further, spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The apparatus may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein may likewise be interpreted accordingly.

In this document, the term “coupled” may also be termed as “electrically coupled”, and the term “connected” may be termed as “electrically connected”. “Coupled” and “connected” may also be used to indicate that two or more elements cooperate or interact with each other.

Other features and processes may also be included. For example, testing structures may be included to aid in the verification testing of the 3D packaging or 3DIC devices. The testing structures may include, for example, test pads formed in a redistribution layer or on a substrate that allows the testing of the 3D packaging or 3DIC, the use of probes and/or probe cards, and the like. The verification testing may be performed on intermediate structures as well as the final structure. Additionally, the structures and methods disclosed herein may be used in conjunction with testing methodologies that incorporate intermediate verification of known good dies to increase the yield and decrease costs.

A semiconductor chip is manufactured by a number of operations. During the manufacturing process, the semiconductor chip is disposed over and bonded with a substrate or wafer and then singulated to become a semiconductor device. Upon singulation, some chippings are peeled off from the semiconductor device or some cracks are developed and propagated into the semiconductor device. The chippings and cracks would cause structural damages to the semiconductor device.

In the present disclosure, a semiconductor structure is disclosed. The semiconductor structure includes a die, a first interconnect structure disposed over a surface of the die, a molding surrounding the die and the first interconnect structure, a second interconnect structure disposed over another surface of the die and the molding, and a conductive bump disposed over the second interconnect structure. A seal ring is disposed within the second interconnect structure and adjacent to an edge of the second interconnect structure. The seal ring is configured to protect the die, the molding or the second interconnect structure from damages caused by cracks, chippings or other contaminants during fabrication or singulation. As such, delamination of components or damages on the semiconductor structure during fabrication or singulation can be minimized or prevented.

FIG. 1 is a schematic cross sectional view of a semiconductor structure 100 in accordance with various embodiments of the present disclosure. In some embodiments, the semiconductor structure 100 includes a die 101, a first interconnect structure 102, a molding 104, a second interconnect structure 105, a first seal ring 106 and a conductive bump 107.

In some embodiments, the semiconductor structure 100 is a semiconductor package. In some embodiments, the semiconductor structure 100 is an integrated fan out (InFO) package, where I/O terminals of the die 101 are fanned out and redistributed over a surface of the die 101 in a greater area. In some embodiments, the semiconductor structure 100 is a system on integrated circuit (SoIC) packaging structure. In some embodiments, the semiconductor structure 100 is a three dimensional integrated circuit (3D IC).

In some embodiments, the die 101 is fabricated with a predetermined functional circuit within the die 101. In some embodiments, the die 101 is singulated from a semiconductive wafer by a mechanical or laser blade. In some embodiments, the die 101 comprises a variety of electrical circuits suitable for a particular application. In some embodiments, the electrical circuits include various devices such as transistors, capacitors, resistors, diodes and/or the like. In some embodiments, the die 101 is a logic device die, graphics processing unit (GPU) die, application processing (AP) die, memory die, high bandwidth memory (HBM) die or the like. In some embodiments, the die 101 is a chip or a package. In some embodiments, the die 101 has a top cross section (a cross section from the top view of the semiconductor structure 100 as shown in FIG. 1) in a quadrilateral, a rectangular or a square shape.

In some embodiments, the die 101 includes a first surface 101 a and a second surface 101 b opposite to the first surface 101 a. In some embodiments, the die 101 includes a sidewall 101 c between the first surface 101 a and the second surface 101 b. In some embodiments, the sidewall 101 c is substantially orthogonal to the first surface 101 a or the second surface 101 b. In some embodiments, the first surface 101 a is an active side that several electrical components are disposed thereon. In some embodiments, the second surface 101 b is an inactive side that electrical component disposed thereon is absent.

In some embodiments, the first interconnect structure 102 is disposed at the substrate 101. In some embodiments, the first interconnect structure 102 is disposed at the first surface 101 a of the substrate 101. In some embodiments, the first interconnect structure 102 is configured to route a path of circuitry from the die 101 and redistribute I/O terminals of the die 101. In some embodiments, the first interconnect structure 102 is configured to electrically connect the die 101 with a circuitry or conductive structure external to the die 101.

In some embodiments, the first interconnect structure 102 includes a first dielectric layer 102 a disposed at the first surface 101 a of the die 101 and several first conductive members 102 b disposed within or over the first dielectric layer 102 a. In some embodiments, the first dielectric layer 102 a is in contact with the first surface 101 a of the die 101. In some embodiments, the first dielectric layer 102 a includes several layers of dielectric material stacking over each other. In some embodiments, the first dielectric layer 102 a includes dielectric material such as silicon oxide, silicon nitride, undoped silicon glass or the like. In some embodiments, the first dielectric layer 102 a includes polymeric material. In some embodiments, the first dielectric layer 102 a includes polyimide (PI), polybenzoxazole (PBO) or the like. In some embodiments, each layer of the first dielectric layer 102 a includes dielectric material different from or same as each other.

In some embodiments, the first conductive member 102 b is disposed within or over the first dielectric layer 102 a. In some embodiments, the first conductive member 102 b includes conductive material such as gold, silver, copper, nickel, tungsten, aluminum, tin and/or alloys thereof. In some embodiments, the first conductive member 102 b extends within the first dielectric layer 102 a. In some embodiments, the first conductive member 102 b extends through one or more layers of the first dielectric layer 102 a. In some embodiments, the first conductive member 102 b is electrically connected to a circuitry of the die 101. In some embodiments, the first conductive member 102 b is disposed at a central portion of the first dielectric layer 102 a.

In some embodiments, the first conductive member 102 b includes a first land portion 102 b-1 and a first via portion 102 b-2 extended from and coupled with the first land portion 102 b-1. In some embodiments, the first land portion 102 b-1 is laterally extended within or over the first dielectric layer 102 a. In some embodiments, the first via portion 102 b-2 is vertically extended within the first dielectric layer 102 a and passes through at least one layer of the first dielectric layer 102 a. In some embodiments, the first land portion 102 b-1 and the first via portion 102 b-2 are stacked over each other. In some embodiments, the first land portion 102 b-1 and the first via portion 102 b-2 are stacked alternately.

In some embodiments, the first land portion 102 b-1 is disposed over the first dielectric layer 102 a. In some embodiments, the first land portion 102 b-1 is at least partially exposed from the first dielectric layer 102 a. In some embodiments, the first land portion 102 b-1 is a bonding pad for receiving, bonding with or electrically connecting with a conductive structure or a circuitry.

In some embodiments, the molding 104 surrounds the die 101 and the first interconnect structure 102. In some embodiments, the molding 104 is in contact with the sidewall 101 c of the die 101 and an edge 102 c of the first dielectric layer 102 a. In some embodiments, the molding 104 can be a single layer film or a composite stack. In some embodiments, the molding 104 includes various materials, such as molding compound, molding underfill, epoxy, resin, or the like. In some embodiments, the molding 104 has a high thermal conductivity, a low moisture absorption rate and a high flexural strength. In some embodiments, the molding 104 includes oxide such as silicon oxide or the like. In some embodiments, the molding 104 includes epoxy, resin, molding compounds or the like.

In some embodiments, the second interconnect structure 105 is disposed over the second surface 101 b of the die 101 and the molding 104. In some embodiments, the second interconnect structure 105 is configured to re-route a path of circuitry from the die 101 or a substrate and redistribute I/O terminals of the die 101 or the substrate. In some embodiments, the second interconnect structure 105 is configured to electrically connect the die 101 or the substrate with a circuitry or conductive structure external to the die 101 or the substrate. In some embodiments, the second interconnect structure 105 is a back side RDL.

In some embodiments, the second interconnect structure 105 includes a second dielectric layer 105 a disposed over the second surface 101 b of the die 101 and the molding 104, and several second conductive members 105 b disposed within or over the second dielectric layer 105 a. In some embodiments, the second dielectric layer 105 a is in contact with the second surface 101 b of the die 101. In some embodiments, the second dielectric layer 105 a includes several layers (105 a-1, 105 a-2, 105 a-3) of dielectric material stacking over each other. In some embodiments, the second dielectric layer 105 a includes dielectric material such as silicon oxide, silicon nitride, undoped silicon glass or the like. In some embodiments, the second dielectric layer 105 a includes polymeric material. In some embodiments, the second dielectric layer 105 a includes polyimide (PI), polybenzoxazole (PBO) or the like. In some embodiments, each layer of the second dielectric layer 105 a includes dielectric material different from or same as each other.

In some embodiments, a first layer 105 a-1 of the second dielectric layer 105 a is disposed over the second surface 101 b of the die 101 and the molding 104. In some embodiments, the first layer 105 a-1 includes oxide such as silicon oxide or the like. In some embodiments, a second layer 105 b-2 is disposed over the first layer 105 a-1. In some embodiments, the second layer 105 b-2 includes nitride such as silicon nitride or the like. In some embodiments, a third layer 105 b-3 is disposed over the second layer 105 b-2. In some embodiments, the third layer 105 b-3 includes nitride such as silicon nitride or the like. In some embodiments, the first layer 105 a-1, the second layer 105 a-2 and the third layer 105 a-3 include same dielectric material as or different dielectric material from each other. Although FIG. 1 shows the second dielectric layer 105 a includes 3 dielectric layers (105 a-1, 105 a-2, 105 a-3), it would be understood that the second dielectric layer 105 b is not limited to include 3 dielectric layers (105 a-1, 105 a-2, 105 a-3). The second dielectric layer 105 b can include one or more dielectric layers.

In some embodiments, the second conductive member 105 b is disposed within or over the second dielectric layer 105 a. In some embodiments, the second conductive member 105 b includes conductive material such as gold, silver, copper, nickel, tungsten, aluminum, tin and/or alloys thereof. In some embodiments, the second conductive member 105 b extends within the second dielectric layer 105 a. In some embodiments, the second conductive member 105 b extends through one or more layers of the second dielectric layer 105 a. In some embodiments, the second conductive member 105 b is electrically connected to a circuitry of the die 101 or a substrate. In some embodiments, the second conductive member 105 b is disposed at a central portion of the second dielectric layer 105 a.

In some embodiments, the second conductive member 105 b includes a second land portion 105 b-1 and a second via portion 105 b-2 extended from and coupled with the second land portion 105 b-1. In some embodiments, the second land portion 105 b-1 is laterally extended within or over the second dielectric layer 105 a. In some embodiments, the second via portion 105 b-2 is vertically extended within the second dielectric layer 105 a and passes through at least one layer of the second dielectric layer 105 a. In some embodiments, the second land portion 105 b-1 and the second via portion 105 b-2 are stacked over each other. In some embodiments, the second land portion 105 b-1 and the second via portion 105 b-2 are stacked alternately.

In some embodiments, the second land portion 105 b-1 is disposed over the second dielectric layer 105 a. In some embodiments, the second land portion 105 b-1 is at least partially exposed from the second dielectric layer 105 a. In some embodiments, the second land portion 105 b-1 is at least partially exposed from the first layer 105 a-1 of the second dielectric layer 105 a. In some embodiments, the second land portion 105 b-1 is disposed over or is in contact with the molding 104. In some embodiments, the second land portion 105 b-1 is a bonding pad for receiving, bonding with or electrically connecting with a conductive structure or a circuitry.

In some embodiments, the second land portion 105 b-1 is surrounded by the second dielectric layer 105 a. In some embodiments, the second land portion 105 b-1 is disposed over the second layer 105 a-2 and at least partially exposed from the third layer 105 a-3 of the second dielectric layer 105 a. In some embodiments, the second land portion 105 b-1 is a bump pad for receiving, bonding with or electrically connecting with a conductive structure or a circuitry. In some embodiments, the second land portion 105 b-1 includes a conductive material such as chromium, copper, gold, titanium, silver, nickel, palladium or tungsten, etc. In some embodiments, the second land portion 105 b-1 is a solderable surface and serves as a platform for receiving a conductive structure.

In some embodiments, the first seal ring 106 is disposed within the second dielectric layer 105 a and disposed over the molding 104. In some embodiments, the first seal ring 106 is disposed adjacent to an edge 105 c of the second dielectric layer 105 a. In some embodiments, the first seal ring 106 is extended through at least one layer of the second dielectric layer 105 a. In some embodiments, the first seal ring 106 is extended between the first layer 105 a-1 and the third layer 105 a-3 of the second dielectric layer 105 a. In some embodiments, the first seal ring 106 is extended between the first layer 105 a-1 and the second layer 105 a-2 of the second dielectric layer 105 a. In some embodiments, the first seal ring 106 is laterally or vertically extended within the second dielectric layer 105 a. In some embodiments, a portion of the second dielectric layer 105 a is disposed between the first seal ring and the molding 104. In some embodiments, the first seal ring 106 is only disposed over the molding 104, but not disposed over the die 101. In some embodiments, the first seal ring 106 disposed over the die 101 is absent. In some embodiments, the first seal ring 106 is isolated from the molding 104.

In some embodiments, the first seal ring 106 is electrically isolated from the second conductive member 105 b. In some embodiments, the first seal ring 106 is electrically isolated from the die 101. In some embodiments, the first seal ring 106 is a dummy structure. In some embodiments, the first seal ring 106 is electrically connected or coupled with the second conductive member 105 b.

In some embodiments, the first seal ring 106 is configured as a barrier for preventing contaminants such as chippings, moisture, chemicals, corrosive material or etc. from penetrating into the semiconductor structure 100 or the second dielectric layer 105 a and preventing cracks from propagating into the semiconductor structure 100 or the second dielectric layer 105 a upon singulation or sawing operations.

In some embodiments, the first seal ring 106 is disposed closer to the edge 105 c of the second dielectric layer 105 a than the second conductive member 105 b. In some embodiments, a distance D2 between the edge 105 c of the second dielectric layer 105 b and the second conductive member 105 b is substantially greater than a distance D1 between the edge 105 c of the second dielectric layer and the first seal ring 106.

FIG. 2 is a schematic top cross section view of the semiconductor structure 100. In some embodiments, the first seal ring 106 is extended along the edge 105 c of the second dielectric layer 105 a. In some embodiments, the first seal ring 106 is extended to surround the second conductive member 105 b. In some embodiments, a top cross section of the first seal ring 106 is in a strip or frame shape.

Referring back to FIG. 1, in some embodiments, the conductive bump 107 is disposed over the second interconnect structure 105. In some embodiments, the conductive bump 107 is disposed over and electrically connected to the second conductive member 105 b. In some embodiments, the conductive bump 107 is disposed over and electrically connected to the second land portion 105 b-1 of the second conductive member 105 b.

In some embodiments, the conductive bump 107 is electrically connected to the first seal ring 106. In some embodiments, the conductive bump 107 is electrically connected to the first seal ring 106 through the second conductive member 105 b. In some embodiments, the conductive bump 107 is bonded with the second conductive member 105 b. In some embodiments, the conductive bump 107 is bonded with the second land portion 105 b-1. In some embodiments, the conductive bump 107 is at least partially exposed from the second dielectric layer 105 a. In some embodiments, an outer surface of the conductive bump 107 is in contact with the second dielectric layer 105 a or the third layer 105 a-3 of the second dielectric layer 105 a.

In some embodiments, the conductive bump 107 is in a cylindrical, spherical or hemispherical shape. In some embodiments, the conductive bump 107 is a solder joint, a solder bump, a solder ball, a ball grid array (BGA) ball, a controlled collapse chip connection (C4) bump, microbump or the like. In some embodiments, the conductive bump 107 is a conductive pillar or post. In some embodiments, the conductive bump 107 includes metals such as lead, tin, copper, gold, nickel, etc. In some embodiments, the conductive bump 107 is configured to bond over another substrate or package and to electrically connect a circuitry of the semiconductor structure 100 with a circuitry of another substrate or package.

In some embodiments, a second seal ring 103 is disposed within the die 101 or the first interconnect structure 102. In some embodiments, the second seal ring 103 is vertically extended within the die 101 or the first dielectric layer 102 a. In some embodiments, the second seal ring 103 is disposed adjacent to the sidewall 101 c of the die 101. In some embodiments, the second seal ring 103 is disposed adjacent to the edge 102 c of the first dielectric layer 102 a. In some embodiments, the second seal ring 103 is disposed adjacent to the molding 103. In some embodiments, the second seal ring 103 is electrically isolated from the first conductive member 102 b. In some embodiments, the second seal ring 103 is a dummy structure. In some embodiments, the second seal ring 103 is configured as a barrier for preventing contaminants such as chippings, moisture, chemicals, corrosive material or etc. from penetrating into the die 101 and preventing cracks from propagating into the die 101 upon singulation or sawing operations. In some embodiments, a width W1 of the first seal ring 106 is substantially greater than a width W2 of the second seal ring 103.

In some embodiments, a via 108 is disposed and extended within the molding 104. In some embodiments, the via 108 is extended through the molding 104. In some embodiments, the via 108 is electrically connected to the second conductive member 105 b. In some embodiments, the via 108 is bonded with the second land portion 105 b-1 of the second conductive member 105 b. In some embodiments, an end of the via 108 is at least partially exposed from the molding 104. In some embodiments, the via 108 is electrically isolated from the first seal ring 106. In some embodiments, the first seal ring 106 coupled with the via 108 is absent. In some embodiments, the first seal ring 106 is not connected to or not coupled with the via 108. In some embodiments, the via 108 includes a conductive material such as copper, silver, gold, aluminum, etc. In some embodiments, the via 108 is a through molding via (TMV) or through oxide via (TOV). In some embodiments, a height of the via 108 is substantially same as a total of a thickness of the die 101 and a thickness of the first dielectric layer 102 a.

In some embodiments, the semiconductor structure 100 includes a substrate 109, a third interconnect structure 110 disposed over the substrate 109. In some embodiments, the die 101 and the molding 104 are disposed over the substrate 109. In some embodiments, the substrate 109 is a semiconductive substrate. In some embodiments, the substrate 109 includes semiconductive material such as silicon, germanium, gallium, arsenic, or combinations thereof. In some embodiments, the substrate 109 is a silicon substrate or silicon interposer. In some embodiments, the substrate 109 includes material such as ceramic, glass, polymer or the like. In some embodiments, the substrate 109 includes organic material. In some embodiments, the substrate 109 is fabricated with a predetermined functional circuit thereon. In some embodiments, the substrate 109 includes several conductive traces and several electrical components such as transistor, diode, etc. disposed within the substrate 109. In some embodiments, the substrate 109 is a printed circuit board (PCB). In some embodiments, the substrate 109 has a quadrilateral, rectangular, square, polygonal or any other suitable shape.

In some embodiments, the substrate 109 includes a third surface 109 a and a fourth surface 109 b opposite to the third surface 109 a. In some embodiments, the third surface 109 a is an active side that several electrical components are disposed thereon. In some embodiments, the fourth surface 109 b is an inactive side that electrical component disposed thereon is absent.

In some embodiments, the third interconnect structure 110 is disposed over the third surface 109 a of the substrate 109. In some embodiments, the third interconnect structure 110 is configured to route a path of circuitry from the substrate 109. In some embodiments, the third interconnect structure 110 is configured to electrically connect the die 101.

In some embodiments, the third interconnect structure 110 includes a third dielectric layer 110 a disposed over the third surface 109 a of the substrate 109, and several third conductive members 110 b disposed within or over the third dielectric layer 110 a. In some embodiments, the third dielectric layer 110 a is in contact with the third surface 109 a of the substrate 109. In some embodiments, the molding 104 is disposed over the third dielectric layer 110 a. In some embodiments, the die 101 is disposed over the third dielectric layer 110 a. In some embodiments, the third dielectric layer 110 a includes several layers of dielectric material stacking over each other. In some embodiments, the third dielectric layer 110 a includes dielectric material such as silicon oxide, silicon nitride, undoped silicon glass or the like. In some embodiments, the third dielectric layer 110 a includes polymeric material. In some embodiments, the third dielectric layer 110 a includes polyimide (PI), polybenzoxazole (PBO) or the like. In some embodiments, each layer of the third dielectric layer 110 a includes dielectric material different from or same as each other.

In some embodiments, the third conductive member 110 b is disposed within or over the third dielectric layer 110 a. In some embodiments, the third conductive member 110 b is bonded with the first conductive member 102 b. In some embodiments, the third conductive member 110 b includes conductive material such as gold, silver, copper, nickel, tungsten, aluminum, tin and/or alloys thereof. In some embodiments, the third conductive member 110 b extends within the third dielectric layer 110 a. In some embodiments, the third conductive member 110 b extends through one or more layers of the third dielectric layer 110 a. In some embodiments, the third conductive member 110 b is electrically connected to a circuitry of the substrate 109. In some embodiments, the third conductive member 110 b is disposed at a central portion of the third dielectric layer 110 a.

In some embodiments, the third conductive member 110 b includes a third land portion 110 b-1 and a third via portion 110 b-2 extended from and coupled with the third land portion 110 b-1. In some embodiments, the third land portion 110 b-1 is laterally extended within or over the third dielectric layer 110 a. In some embodiments, the third via portion 110 b-2 is vertically extended within the third dielectric layer 110 a and passes through at least one layer of the third dielectric layer 110 a. In some embodiments, the third land portion 110 b-1 and the third via portion 110 b-2 are stacked over each other. In some embodiments, the third land portion 110 b-1 and the third via portion 110 b-2 are stacked alternately.

In some embodiments, the third land portion 110 b-1 is disposed over the third dielectric layer 110 a. In some embodiments, the third land portion 110 b-1 is at least partially exposed from the third dielectric layer 110 a. In some embodiments, the third land portion 110 b-1 is disposed over or is in contact with the molding 104. In some embodiments, the third land portion 110 b-1 is a bonding pad for receiving, bonding with or electrically connecting with a conductive structure or a circuitry.

In some embodiments, the third land portion 110 b-1 is coupled or bonded with the via 108. In some embodiments, the third land portion 110 b-1 is coupled or bonded with the first conductive member 102 b. In some embodiments, the third land portion 110 b-1 is coupled or bonded with the first land portion 102 b-1 of the first conductive member 102 b. In some embodiments, the third land portion 110 b-1 is eutectically bonded with the first land portion 102 b-1. In some embodiments, the third land portion 110 b-1 is vertically aligned with the first land portion 102 b-1.

In some embodiments, a third seal ring 111 is disposed within the third dielectric layer 110 a. In some embodiments, the third seal ring 111 is vertically extended within the third dielectric layer 110 a. In some embodiments, the third seal ring 111 is disposed adjacent to an edge 110 c of the third dielectric layer 110 a. In some embodiments, the third seal ring 111 is electrically isolated from the third conductive member 110 b. In some embodiments, the third seal ring 111 is a dummy structure. In some embodiments, the third seal ring 111 is vertically aligned with the first seal ring 106. In some embodiments, the third seal ring 111 is configured as a barrier for preventing contaminants such as chippings, moisture, chemicals, corrosive material or etc. from penetrating into the substrate 109 and preventing cracks from propagating into the substrate 109 upon singulation or sawing operations. In some embodiments, the width W1 of the first seal ring 106 is substantially greater than a width W3 of the third seal ring 111.

FIG. 3 is a schematic cross sectional view of a semiconductor structure 200 in accordance with various embodiments of the present disclosure, and FIG. 4 is a schematic top cross sectional view of the semiconductor structure 200. In some embodiments, the semiconductor structure 200 includes the die 101, the first interconnect structure 102, the molding 104, the second interconnect structure 105, the first seal ring 106, the conductive bump 107, the substrate 109 and the third interconnect structure 110, which have similar configurations as those described above or illustrated in FIG. 1.

In some embodiments, the semiconductor structure 200 includes more than one first seal rings 106 disposed within the first dielectric layer 102 a. In some embodiments as shown in FIGS. 3 and 4, two first seal rings 106 are extended along the edge 105 c of the second dielectric layer 105 a. In some embodiments, two first seal rings 106 are extended to surround the second conductive structure 105 b. In some embodiments, top cross sections of two first seal rings 106 are in strip or frame shape.

FIG. 5 is a schematic top cross section view of the semiconductor structure 300. In some embodiments, the semiconductor structure 300 includes the die 101, the first interconnect structure 102, the molding 104, the second interconnect structure 105, the first seal ring 106, the conductive bump 107, the substrate 109 and the third interconnect structure 110, which have similar configurations as those described above or illustrated in FIG. 1. In some embodiments, the first seal ring 106 is in contact with the second conductive member 105 b. In some embodiments, the first seal ring 106 is connected to an electrical ground. In some embodiments, the conductive bump 107 is connected to the electrical ground. In some embodiments, the first seal ring 106 is connected to the electrical ground through the conductive bump 107 or the second conductive member 105 b.

In the present disclosure, a method of manufacturing a semiconductor structure (100, 200, 300) is also disclosed. In some embodiments, the semiconductor structure (100, 200, 300) is formed by a method 400. The method 400 includes a number of operations and the description and illustration are not deemed as a limitation as the sequence of the operations. FIG. 6 is an embodiment of the method 300 of manufacturing the semiconductor structure (100, 200, 300). The method 300 includes a number of operations (401, 402, 403, 404, 405, 406 and 407).

In operation 401, a die 101 is provided or received as shown in FIG. 7A. In some embodiments, the die 101 includes a first surface 101 a and a second surface 101 b opposite to the first surface 101 a. In some embodiments, the die 101 is a chip or a package. In some embodiments, the die 101 has configuration similar to the one described above or illustrated in FIG. 1, 3 or 5.

In operation 402, a first dielectric layer 102 a is disposed at the die 101 as shown in FIG. 7B. In some embodiments, the first dielectric layer 102 a is disposed at the first surface 101 a of the die 101. In some embodiments, the first dielectric layer 102 a includes several layers of dielectric material stacking over each other. In some embodiments, the first dielectric layer 102 a includes dielectric material such as silicon oxide, silicon nitride, undoped silicon glass or the like. In some embodiments, the first dielectric layer 102 a includes polymeric material such as polyimide (PI), polybenzoxazole (PBO) or the like. In some embodiments, the first dielectric layer 102 a is deposited by spin coating, chemical vapor deposition (CVD), plasma-enhanced CVD (PECVD), high-density plasma CVD (HDPCVD) or any other suitable operations.

In operation 403, a first conductive member 102 b is formed within or over the first dielectric layer 102 a as shown in FIG. 7C. In some embodiments, the first conductive member 102 b is extended through at least one layer of the first dielectric layer 102 a. In some embodiments, the first conductive member 102 b is formed by removing a portion of the first dielectric layer 102 a to form an opening and then disposing a conductive material into the opening. In some embodiments, the removal of the portion of the first dielectric layer 102 a includes photolithography, etching or any other suitable operations. In some embodiments, the disposing of the conductive material includes sputtering, electroplating or any other suitable operations. In some embodiments, the conductive material includes copper, silver, gold, aluminum, etc.

In some embodiments, the first conductive member 102 b includes a first land portion 102 b-1 and a first via portion 102 b-2 coupled with the first land portion 102 b-1. In some embodiments, the first land portion 102 b-1 and the first via portion 102 b-2 are stacked over each other. In some embodiments, the first land portion 102 b-1 and the first via portion 102 b-2 are stacked alternately. In some embodiments, a first interconnect structure 102 including the first dielectric layer 102 a and the first conductive member 102 b is formed over the die 101 or the first surface 101 a of the die 101. In some embodiments, the first interconnect structure 102, the first dielectric layer 102 a and the first conductive member 102 b have configuration similar to those described above or illustrated in FIG. 1, 3 or 5.

In some embodiments, a second seal ring 103 is formed within the die 101 or the first dielectric layer 102 a. In some embodiments, the second seal ring 103 is formed adjacent to a sidewall 101 c of the die 101 or an edge 102 c of the first dielectric layer 102 a. In some embodiments, the second seal ring 103 is electrically isolated from the first conductive member 102 b. In some embodiments, the second seal ring 103 is formed by removing a portion of the die 101 or a portion of the first dielectric layer 102 a to form an opening, and then disposing a conductive material into the opening. In some embodiments, the removal of the portion of the die 101 and the portion of the first dielectric layer 102 a includes photolithography, etching or any other suitable operations. In some embodiments, the disposing of the conductive material includes sputtering, electroplating or any other suitable operations. In some embodiments, the conductive material includes copper, silver, gold, aluminum, etc. In some embodiments, the second seal ring 103 has configuration similar to those described above or illustrated in FIG. 1, 3 or 5.

In operation 404, a molding 104 is formed as shown in FIG. 7D. In some embodiments, the molding 104 is disposed around the die 101 and the first dielectric layer 102 a. In some embodiments, the molding 104 is in contact with the sidewall 101 c of the die 101 and the edge 102 c of the first dielectric layer 102 a. In some embodiments, the molding 104 is formed by transfer molding, injection molding, over molding or any other suitable operations. In some embodiments, the molding 104 includes various materials, such as oxide, molding compound, epoxy, resin, or the like. In some embodiments, the molding 104 has configuration similar to the one described above or illustrated in FIG. 1, 3 or 5.

In some embodiments, a via 108 is formed within the molding 104. In some embodiments, the via 108 is extended through the molding 104. In some embodiments, the via 108 is a through molding via (TMV) or through oxide via (TOV). In some embodiments, the via 108 is formed by removing a portion of the molding 104 to form an opening, and then disposing a conductive material into the opening. In some embodiments, the removal of the portion of the molding 104 includes photolithography, etching or any other suitable operations. In some embodiments, the disposing of the conductive material includes sputtering, electroplating or any other suitable operations. In some embodiments, the conductive material includes copper, silver, gold, aluminum, etc. In some embodiments, the via 108 has configuration similar to the one described above or illustrated in FIG. 1, 3 or 5.

In operation 405, a second dielectric layer 105 a is disposed over the second surface 101 b of the die 101 and the molding 104 as shown in FIG. 7E. In some embodiments, the second dielectric layer 105 a includes several layers of dielectric material stacking over each other. In some embodiments, the second dielectric layer 105 a includes dielectric material such as silicon oxide, silicon nitride, undoped silicon glass or the like. In some embodiments, the second dielectric layer 105 a includes polymeric material such as polyimide (PI), polybenzoxazole (PBO) or the like. In some embodiments, the second dielectric layer 105 a is deposited by spin coating, chemical vapor deposition (CVD), plasma-enhanced CVD (PECVD), high-density plasma CVD (HDPCVD) or any other suitable operations. In some embodiments, the second dielectric layer 105 a has configuration similar to the one described above or illustrated in FIG. 1, 3 or 5.

In some embodiments, the second dielectric layer 105 a includes several layers (105 a-1, 105 a-2, 105 a-3) stacking over each other. In some embodiments, a first layer 105 a-1 is disposed over the second surface 101 b of the die 101 and the molding 104, then a second layer 105 a-2 is disposed over the first layer 105 a-1, and then a third layer 105 a-3 is disposed over the second layer 105 a-2. In some embodiments, each layer (105 a-1, 105 a-2, 105 a-3) of the second dielectric layer 105 a includes dielectric material different from or same as each other.

In operation 406, a second conductive member 105 b and a first seal ring 106 are disposed within the second dielectric layer 105 a as shown in FIG. 7F. In some embodiments, the second conductive member 105 b is extended through at least one layer of the second dielectric layer 105 a. In some embodiments, the second conductive member 105 b is formed at a central portion of the second dielectric layer 105 a. In some embodiments, the second conductive member 105 b is electrically connected to or bonded with the via 108. In some embodiments, the second conductive member 105 b is formed by removing a portion of the second dielectric layer 105 a to form an opening and then disposing a conductive material into the opening. In some embodiments, the removal of the portion of the second dielectric layer 105 a includes photolithography, etching or any other suitable operations. In some embodiments, the disposing of the conductive material includes sputtering, electroplating or any other suitable operations. In some embodiments, the conductive material includes copper, silver, gold, aluminum, etc.

In some embodiments, the second conductive member 105 b includes a second land portion 105 b-1 and a second via portion 105 b-2 coupled with the second land portion 105 b-1. In some embodiments, the second land portion 105 b-1 and the second via portion 105 b-2 are stacked over each other. In some embodiments, the second land portion 105 b-1 and the second via portion 105 b-2 are stacked alternately. In some embodiments, a second interconnect structure 105 including the second dielectric layer 105 a and the second conductive member 105 b is formed over the die 101 and the molding 104. In some embodiments, the second interconnect structure 105, the second dielectric layer 105 a and the second conductive member 105 b have configuration similar to those described above or illustrated in FIG. 1, 3 or 5.

In some embodiments, a first seal ring 106 is formed within the second dielectric layer 105 a. In some embodiments, the first seal ring 106 is formed adjacent to edge 105 c of the second dielectric layer 105 a. In some embodiments, the first seal ring 106 is formed over the molding 104. In some embodiments, the first seal ring 106 is electrically isolated from the second conductive member 105 b. In some embodiments, the first seal ring 106 is electrically connected to the second conductive member 105 b. In some embodiments, the first seal ring 106 is connected to electrical ground. In some embodiments, the first seal ring 106 is vertically extended within at least one layer of the second dielectric layer 105 a.

In some embodiments, the first seal ring 106 is formed by removing a portion of the second dielectric layer 105 a adjacent to the edge 105 c of the second dielectric layer 105 a to form a recess, and then disposing a conductive material into the recess. In some embodiments, the removal of the portion of the second dielectric layer 105 a includes photolithography, etching or any other suitable operations. In some embodiments, the disposing of the conductive material includes sputtering, electroplating or any other suitable operations. In some embodiments, the conductive material includes copper, silver, gold, aluminum, etc. In some embodiments, the first seal ring 106 has configuration similar to those described above or illustrated in FIG. 1, 3 or 5.

In operation 407, a conductive bump 107 is disposed over the second dielectric layer 105 b as shown in FIG. 7G. In some embodiments, the conductive bump 107 is disposed over and electrically connected to the second conductive member 105 b. In some embodiments, the conductive bump 107 is disposed over and electrically connected to the second land portion 105 b-1. In some embodiments, the conductive bump 107 is disposed over the second conductive member 105 b, and then the third layer 105 a-3 of the second dielectric layer 105 a is disposed over the second conductive member 105 b to surround the conductive bump 107.

In some embodiments, the conductive bump 107 is disposed by ball dropping, solder pasting, stencil printing or any other suitable operations. In some embodiments, the conductive bump 107 is a solder joint, a solder bump, a solder ball, a ball grid array (BGA) ball, a controlled collapse chip connection (C4) bump, microbump or the like. In some embodiments, the conductive bump 107 is a conductive pillar or post. In some embodiments, the conductive bump 107 has configuration similar to the one described above or illustrated in FIG. 1, 3 or 5.

In some embodiments, a substrate 109 is provided or received as shown in FIG. 7H. In some embodiments, the substrate 109 is a semiconductive substrate. In some embodiments, the substrate 109 includes semiconductive material such as silicon, germanium, gallium, arsenic, or combinations thereof. In some embodiments, the substrate 109 is a silicon substrate or silicon interposer. In some embodiments, the substrate 109 includes material such as ceramic, glass, polymer or the like. In some embodiments, the substrate 109 includes organic material. In some embodiments, the substrate 109 is a printed circuit board (PCB). In some embodiments, the substrate 109 includes a third surface 109 a and a fourth surface 109 b opposite to the third surface 109 a.

In some embodiments, a third dielectric layer 110 a is disposed at the substrate 109 as shown in FIG. 7I. In some embodiments, the third dielectric layer 110 a includes several layers of dielectric material stacking over each other. In some embodiments, the third dielectric layer 110 a includes dielectric material such as silicon oxide, silicon nitride, undoped silicon glass or the like. In some embodiments, the third dielectric layer 110 a includes polymeric material such as polyimide (PI), polybenzoxazole (PBO) or the like. In some embodiments, the third dielectric layer 110 a is deposited by spin coating, chemical vapor deposition (CVD), plasma-enhanced CVD (PECVD), high-density plasma CVD (HDPCVD) or any other suitable operations. In some embodiments, the third dielectric layer 110 a has configuration similar to the one described above or illustrated in FIG. 1, 3 or 5.

In some embodiments, a third conductive member 110 b is formed over or within the third dielectric layer 110 a as shown in FIG. 7J. In some embodiments, the third conductive member 110 b is extended through at least one layer of the third dielectric layer 110 a. In some embodiments, the third conductive member 110 b is formed at a central portion of the third dielectric layer 110 a. In some embodiments, the third conductive member 110 b is formed by removing a portion of the third dielectric layer 110 a to form an opening and then disposing a conductive material into the opening. In some embodiments, the removal of the portion of the third dielectric layer 110 a includes photolithography, etching or any other suitable operations. In some embodiments, the disposing of the conductive material includes sputtering, electroplating or any other suitable operations. In some embodiments, the conductive material includes copper, silver, gold, aluminum, etc.

In some embodiments, the third conductive member 110 b includes a third land portion 110 b-1 and a third via portion 110 b-2 coupled with the third land portion 110 b-1. In some embodiments, the third land portion 110 b-1 and the third via portion 110 b-2 are stacked over each other. In some embodiments, the third land portion 110 b-1 and the third via portion 110 b-2 are stacked alternately. In some embodiments, a third interconnect structure 110 including the third dielectric layer 110 a and the third conductive member 110 b is formed over the substrate 109. In some embodiments, the third interconnect structure 110, the second dielectric layer 105 a and the second conductive member 105 b third dielectric layer 110 a and the third conductive member 110 b have configuration similar to those described above or illustrated in FIG. 1, 3 or 5.

In some embodiments, a third seal ring 111 is formed within the third dielectric layer 110 a. In some embodiments, the third seal ring 111 is formed adjacent to edge 110 c of the third dielectric layer 110 a. In some embodiments, the third seal ring 111 is electrically isolated from the third conductive member 110 b. In some embodiments, the third seal ring 111 is vertically extended within at least one layer of the third dielectric layer 110 a.

In some embodiments, the third seal ring 111 is formed by removing a portion of the third dielectric layer 110 a adjacent to the edge 110 c of the third dielectric layer 110 a to form an opening, and then disposing a conductive material into the opening. In some embodiments, the removal of the portion of the third dielectric layer 110 a includes photolithography, etching or any other suitable operations. In some embodiments, the disposing of the conductive material includes sputtering, electroplating or any other suitable operations. In some embodiments, the conductive material includes copper, silver, gold, aluminum, etc. In some embodiments, the third seal ring 111 has configuration similar to those described above or illustrated in FIG. 1, 3 or 5.

In some embodiments, the first conductive member 102 b is bonded with the third conductive member 110 b as shown in FIG. 7K. In some embodiments, the first conductive member 102 b is vertically aligned with the third conductive member 110 b. In some embodiments, the first conductive member 102 b is bonded with the third conductive member 110 b by eutectic bonding or any other suitable operations. In some embodiments, the first land portion 102 b-1 is bonded with the third land portion 110 b-1. In some embodiments, the molding 104 and the first dielectric layer 102 a are disposed over or bonded with the third dielectric layer 110 a. In some embodiments, the third conductive member 110 b is electrically connected to or bonded with the via 108. In some embodiments, the die 101 and the substrate 109 are electrically connected. In some embodiments, the substrate 109 is electrically connected to a circuitry through the third conductive member 110 b, the via 108, the second conductive member 105 b and the conductive bump 107. In some embodiments, the semiconductor structure (100, 200, 300) as shown in FIG. 1, 3 or 5 is formed.

In the present disclosure, a semiconductor structure is disclosed. The semiconductor structure includes a die, a molding surrounding the die, an interconnect structure disposed over the die and the molding, and a seal ring disposed within the interconnect structure and adjacent to an edge of the interconnect structure. The seal ring is configured to protect the die, the molding or the interconnect structure from damages caused by cracks, chippings or other contaminants during fabrication or singulation. As such, damages on the semiconductor structure during fabrication or singulation can be minimized or prevented.

In some embodiments, a semiconductor structure is disclosed. The semiconductor structure includes a die, a molding surrounding the die, an interconnect structure disposed over the die and the molding, and a first seal ring. The interconnect structure includes a dielectric layer and a conductive member disposed within the dielectric layer. The first seal ring is disposed within the dielectric layer and disposed over the molding.

In some embodiments, the first seal ring is disposed adjacent to an edge of the dielectric layer. In some embodiments, the first seal ring is electrically connected to the conductive member. In some embodiments, the first seal ring is connected to an electrical ground through a conductive bump. In some embodiments, the first seal ring surrounds the conductive member. In some embodiments, a portion of the dielectric layer is disposed between the first seal ring and the molding. In some embodiments, the semiconductor structure further includes a second seal ring vertically extended within the die. In some embodiments, the second seal ring is disposed adjacent to the edge of the die or the molding. In some embodiments, a width of the first seal ring is substantially greater than a width of the second seal ring. In some embodiments, the semiconductor structure further includes a via disposed within and extended through the molding. In some embodiments, the first seal ring is electrically isolated from the via. In some embodiments, the semiconductor structure further includes a conductive bump, wherein the interconnect structure is dispose between the conductive bump and the die. In some embodiments, the conductive bump is electrically connected to the via through the interconnect structure.

In some embodiments, a semiconductor structure includes a die including a first surface and a second surface opposite to the first surface; a first interconnect structure disposed over the first surface of the die; a molding surrounding the die and the first interconnect structure; a second interconnect structure disposed over the second surface and the molding; and a first seal ring disposed win the second interconnect structure and disposed over the molding.

In some embodiments, the first interconnect structure further includes a first dielectric layer disposed over the first surface of the die and a first conductive member disposed within the first dielectric layer. In embodiments, the second interconnect structure further includes a second dielectric layer disposed over the second surface of the die and a second conductive member disposed within the second dielectric layer, and the first seal ring is disposed within the second dielectric layer. In some embodiments, the semiconductor structure further includes a third interconnect structure disposed over the first interconnect structure and the molding; and a substrate, wherein the third interconnect structure is disposed between the substrate and the first interconnect structure. In some embodiments, the semiconductor structure further includes a second seal ring vertically extended within the third dielectric layer and disposed adjacent to an edge of the third dielectric layer.

In some embodiments, a method of manufacturing a semiconductor structure includes providing a die including a first surface and a second surface opposite to the first surface; disposing a first interconnect structure at the first surface; forming a molding around the die and the first interconnect structure; disposing a dielectric layer over the second surface and the molding; and forming a conductive member and a first seal ring within the dielectric layer; and disposing a conductive bump over the second dielectric layer, wherein the first seal ring is disposed over the molding.

In some embodiments, the method further includes forming a second seal ring in the first interconnect structure. In some embodiments, the method further includes providing a substrate; disposing a second interconnect structure over the substrate; and bonding the first interconnect structure and the second interconnect structure.

The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure. 

1. A semiconductor structure, comprising: a die; a molding surrounding the die; an interconnect structure disposed over the die and the molding, and including a dielectric layer and a conductive member disposed within the dielectric layer; and a first seal ring is disposed within the dielectric layer and disposed over the molding.
 2. The semiconductor structure of claim 1, wherein the first seal ring is disposed adjacent to an edge of the dielectric layer.
 3. The semiconductor structure of claim 1, wherein the first seal ring is electrically connected to the conductive member.
 4. The semiconductor structure of claim 1, wherein the first seal ring is connected to an electrical ground through a conductive bump.
 5. The semiconductor structure of claim 1, wherein the first seal ring surrounds the conductive member.
 6. The semiconductor structure of claim 1, wherein a portion of the dielectric layer is disposed between the first seal ring and the molding.
 7. The semiconductor structure of claim 1, further comprising a second seal ring vertically extended within the die, wherein the second seal ring is disposed adjacent to the edge of the die or the molding.
 8. The semiconductor structure of claim 7, wherein a width of the first seal ring is substantially greater than a width of the second seal ring.
 9. The semiconductor structure of claim 1, further comprising a via disposed within and extended through the molding.
 10. The semiconductor structure of claim 9, wherein the first seal ring is electrically isolated from the via.
 11. The semiconductor structure of claim 9, further comprising a conductive bump, wherein the interconnect structure is disposed between the conductive bump and the die.
 12. The semiconductor structure of claim 11, wherein the conductive bump is electrically connected to the via through the interconnect structure.
 13. A semiconductor structure, comprising: a die including a first surface and a second surface opposite to the first surface; a first interconnect structure disposed over the first surface of the die; a molding surrounding the die and the first interconnect structure; a second interconnect structure disposed over the second surface and the molding; and a first seal ring disposed in the second interconnect structure and disposed over the molding.
 14. The semiconductor structure of claim 13, wherein the first interconnect structure further comprises a first dielectric layer disposed over the first surface of the die and a first conductive member disposed within the first dielectric layer.
 15. The semiconductor structure of claim 13, wherein the second interconnect structure further comprises a second dielectric layer disposed over the second surface of the die and a second conductive member disposed within the second dielectric layer, and the first seal ring is disposed within the second dielectric layer.
 16. The semiconductor structure of claim 13, further comprising: a third interconnect structure disposed over the first interconnect structure and the molding; and a substrate, wherein the third interconnect structure is disposed between the substrate and the first interconnect structure.
 17. The semiconductor structure of claim 16, further comprising a second seal ring vertically extended within the third dielectric layer and disposed adjacent to an edge of the third dielectric layer.
 18. A method of manufacturing a semiconductor structure, comprising: providing a die a first surface and a second surface opposite to the first surface; disposing a first interconnect structure at the first surface; forming a molding around the die and the first interconnect structure; disposing a dielectric layer over the second surface and the molding; and forming a conductive member and a first seal ring within the dielectric layer, wherein the first seal ring is disposed over the molding.
 19. The method of claim 18, further comprising forming a second seal ring in the first interconnect structure.
 20. The method of claim 18, further comprising: providing a substrate; disposing a second interconnect structure over the substrate; forming a third seal ring extended in the second interconnect structure; and bonding the first interconnect structure and the second interconnect structure. 